Not so with iRobot’s new Roomba i7+ ($950), which empties itself. While the device is powering up, a separate vacuum inside its base charger sucks the dirt and dust from the Roomba’s innards ...

This is by some distance the slickest and most premium cleaning droid ever made. The i7+ has a large, bagged dust collector that, after every clean, actually sucks the dirt out of the robot's own ...